61% (1999)

42% (1996)

47% (1993)

59% (1995)

34% (1995)

57% (1994)

50% (1998)

30% (1998)

45% (1996)

48% (1989)

50% (1993)

55% (1991)

52% (1992)

33% (1997)

46% (1997)

52% (1994)

45% (1993)

49% (1994)

33% (1998)

55% (1995)